Albert Barnes Commentary 1 Chronicles 27:5

"The third captain of the host for the third month was Benaiah, the son of Jehoiada the priest, chief: and in his course were twenty and four thousand." — 1 Chronicles 27:5 (ASV)

A chief priest—Rather, “the chief priest”—an expression which means not the high priest, but probably the high priest’s deputy, who is sometimes called “the second priest” (2 Kings 25:18).